18454200820 has 24 divisors (see below), whose sum is σ = 42276896928. Its totient is φ = 6710618400.

The previous prime is 18454200803. The next prime is 18454200829. The reversal of 18454200820 is 2800245481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18454200829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41941146 + ... + 41941585.

It is an arithmetic number, because the mean of its divisors is an integer number (1761537372).

Almost surely, 2^18454200820 is an apocalyptic number.

18454200820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18454200820 is an abundant number, since it is smaller than the sum of its proper divisors (23822696108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18454200820 is a wasteful number, since it uses less digits than its factorization.

18454200820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83882751 (or 83882749 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 34.

The spelling of 18454200820 in words is "eighteen billion, four hundred fifty-four million, two hundred thousand, eight hundred twenty".